\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*}p_{ij}+p\delta_{ij}=\mu\left(\partial_i v_j+\partial_j v_i -\frac{2}{d}\delta_{ij}\nabla\cdot\mathbf{v}\right)+\mu_B \delta_{ij} \nabla\cdot \mathbf{v}\end{equation*}
\end{document}
